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#include<bits/stdc++.h>
using namespace std;
int n,r,w,tim,t[5000002],t2[5000002],wynik,licz,mini;
vector<pair<int,int> > v;

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	for(int i=1;i <= n;i++)
	{
		cin >> r >> w >> tim;
		int a = w-tim;
		v.push_back(make_pair(a,r));
		mini = min(mini,a);
	}
	for(int i=0;i < v.size();i++)
	{
		if(v[i].second == 1)
			t[v[i].first+(mini*-1)]++;
		else
			t2[v[i].first+(mini*-1)]++;
	}
	for(int i=0;i <= 5e6;i++)
	{
		if(t[i] > 0 && t2[i] > 0)
			licz += min(t[i],t2[i]);
	}
	cout << licz << endl;
}